Loopback Test - GE MiCOM P40 Agile Technical Manual

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Chapter 25 - Commissioning Instructions

LOOPBACK TEST

It is necessary to loop the transmitted electrical G.703 signal presented on terminals 3 and 4 of the P591 to the

received signal presented on terminals 7 and 8.

If test links have been designed into the scheme to facilitate this they should be used. Alternatively, remove any

external wiring from terminals 3, 4, 7 and 8 at the rear of each P591 unit. Loopback the G.703 signals on each

device by connecting a wire link between terminals 3 and 7, and a second wire between terminals 4 and 8.

With the 'OPTO LOOPBACK' switch in the '1' position, the receive and transmit optical ports are connected together.

This allows the optical fibre communications between the IED and the P592 to be tested, but not the internal

circuitry of the P592 itself.

Set the 'OPTO LOOPBACK' switch to 'OFF' and 'X.21 LOOPBACK' switch to 'ON' respectively. With the 'X.21

LOOPBACK' switch in this position the 'Receive Data' and 'Transmit Data' lines of the X.21 communication interface

are connected together. This allows the optical fibre communications between the IED and the P593, and the

internal circuitry of the P593 itself to be tested.

P54x1i-TM-EN-1

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